Improvement in adjustable eccentrics for pumps



B. F. SPRY.

ADJUSTABLE ECCEN'IRICS FOR PUMPS.

Na. 177,435. Patented May 16,1876.

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- UNITE STATES PATENT, OEEIoE.

BENJAMIN F. SPRY, OF HARTFORD, IOWA.

IMPROVEMENT IN ADJUSTABLE EccENTRics EoRPUMPS.

Specification forming partof Letters Patent N 0. 177,435, dated May 16,1876 application filed July 23, ms.

To all whom it may concern Be it-known that I, BENJAMIN F. SPRY, ofHartford, in the county of Warren and State of Iowa, have invented anAdjustable Eccentric for Operating Pumps, & c., of which the followingis a specification:

The object of my invention is to provide a simple, practical means ofadjusting the geometrical center of an eccentric relative to its shaft,for the purpose of-lengthening and shortening the reciprocating strokeof the rod' connected therewith. It consists in a slotted disk, having aseries of notches on the sides of the slot, and a yoke, having slots toform bearings for the shaft carrying the disk, mounted and combined ashereinafter fully set forth.

Figure 1 of my drawing is a perspective view, illustratingtheconstruction of the disk.

A represents the disk, which may be cast complete in one piece, and varyin size, as desired. a a is a flange, extending laterally from itscircumference. b b are notched or perforated flanges, extendinglaterally from the sides of the slot 0.

Fig. 2 is a perspective view, illustrating the construction of myslotted yoke.

B represents a half-section, cast complete in one piece. d d areparallel vertical bars, corresponding in lengthv with the diameter ofthe disk A. f is a cross-bar, connecting the top ends of the bars d. Itextends laterally and inwardly to form a bearing-surface for theperiphery of the disk A. g is a perforated ear on the top of the bar f,designedto receive a bolt. f is a cross-bar, connecting the bottom endsof 'the bars at, and corresponds in form and size with the top bar f. his a perforated shank, extending downward, designed to be bolted to apitman or rod. A second section, corresponding with the device B, isrequired, and the two parts bolted together form my complete slottedy'oke.

Fig. 3 is a perspective view, illustrating the construction,application,-and operation of my complete adjustable eccentric.

0 represents the top of a pump. k k are shaft-bearers, rigidly securedto the pump 0 in any suitable way. m is a shaft, passed through the slot0 of the disk A and the slots D in the yoke B B, and rests upon itsbearers la. a is a pin, passed through the notches in the flange b ofthe disk A to hold the disk and shaft rigidly together. E represents adriving-wheel rigidly fixed on the end of the shaft m. 1 represents apiston-rod bolted to the shank h of the yoke B.

In the practical operation of my invention, rotary motion may beimparted to the wheel E by hand, by means of a crank, or any suitablepower may be applied by means of belts or gearing. Rotating the wheel Eand its shaft m works the disk A, as an eccentric on the shaft'm, andthereby imparts a reciprocating rectilinear motion to the slotted yokeB, and the rod or pitman 4" connected with the yoke. The'slots l), inthe yoke through which the shaft m passes, prevent the yoke and rod 1'from getting out of their vertical relation to the shaft m, and, at thesame time, allow them reciprocal motion corresponding with the movementof the eccentric A. To regulate the length of the stroke of the pitman1' for' various powers and purposes, withdraw the pin a, or itsequivalent, and move the disk A on the shaft on to change its centerrelative to the shaft m. The space between the center of the shaft andthe center of the disk will always be the half of the length of thestroke 'of the rod 1, and my eccentric can therefore be readily formedand adjusted at will to secure any length of stroke desired.

I claim as my invention The disk A having perforated or notched flangesb on the sides of its slot 0, the yoke B B having slots D, incombination with the shaft m, and rod or piston r, to form an adjustableeccentric, substantially as and for the purposes shown and described.

BENJAMIN FRANKLIN SPRY.

Witnesses:

W. O. SHEPHERD, D. T. MIOHENER.

